Expose uriScheme through vscode.env (#71397)

* Expose uri scheme through vscode.env

src/vs/workbench/api/node/extHost.api.impl.ts

@@ -235,6 +235,7 @@ export function createApiFactory(
 			get language() { return platform.language!; },
 			get appName() { return product.nameLong; },
 			get appRoot() { return initData.environment.appRoot!.fsPath; },
+			get uriScheme() { return product.urlProtocol; },
 			get logLevel() {
 				checkProposedApiEnabled(extension);
 				return typeConverters.LogLevel.to(extHostLogService.getLevel());